CN202563626U - Telephone line disconnection alarm device - Google Patents
Telephone line disconnection alarm device Download PDFInfo
- Publication number
- CN202563626U CN202563626U CN2012201160714U CN201220116071U CN202563626U CN 202563626 U CN202563626 U CN 202563626U CN 2012201160714 U CN2012201160714 U CN 2012201160714U CN 201220116071 U CN201220116071 U CN 201220116071U CN 202563626 U CN202563626 U CN 202563626U
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- China
- Prior art keywords
- telephone line
- pin
- alarm device
- electronic switch
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a telephone line disconnection alarm device. The telephone line disconnection alarm device comprises a detection electronic switch and an alarm circuit, wherein the detection electronic switch consists of a resistor, a triode and a capacitor; the alarm device consists of an integrated chip (IC), a resistor, a loudspeaker and a capacitor; and the ends a and b of the detection electronic switch are connected with the two ends of a telephone line. The telephone line disconnection alarm device is simple in structure and reasonable in deign; alarm prompt can be performed at the first time when a lawless person cuts off the telephone line and makes an attempt to steal, so that the safety of pubic property is protected.
Description
Technical field
The utility model belongs to the electronic alarm field, is specifically related to a kind of telephone wire wire break alarm.
Background technology
In development in science and technology swift and violent today; It is flourishing more that communications industry also becomes; Telephone wire then is the tie that people contact is linked up; Yet some lawless persons have but aimed at the interests that telephone wire brings, and the illegal activities of illegally stealing telephone wire have also brought loss to country when therefore bringing the communication puzzlement to people.
The utility model content
The utility model purpose: the purpose of the utility model is in order to solve the deficiency of prior art, a kind of telephone wire wire break alarm simple in structure to be provided.
Technical scheme: the described a kind of telephone wire wire break alarm of the utility model; Comprise power supply E, switch S, detection electronic switch and warning circuit; Said detection electronic switch is by resistance R 1, triode VT1, and VT2 and capacitor C 1 constitute, and the base stage of said VT1 is connected with an end of resistance; The emitter of VT1 is connected with the base stage of VT2, and the emitter of said VT2 is connected with an end of capacitor C 1; Said warning circuit is made up of IC integrated chip, resistance R 2, loudspeaker and capacitor C 2; Be connected with R2 between 1 pin of said IC integrated chip and 2 pin; 5 pin of said IC integrated chip are connected with the emitter of VT2 with 8 pin, and 4 pin of said IC integrated chip are connected with loudspeaker.
As preferably, the voltage range of said power supply E is 3～4.5V.
The a of said detection electronic switch, b two ends are connected with telephone wire.
Beneficial effect: the utility model is simple in structure, and is reasonable in design, can cut off the very first time that telephone wire attempts to steal the lawless person and carry out alarm, protected the safety of public property.
Description of drawings
Accompanying drawing 1 is the utility model electrical block diagram.
Embodiment
Be described further below in conjunction with 1 pair of the utility model of accompanying drawing:
Shown in accompanying drawing 1; A kind of telephone wire wire break alarm comprises power supply E, switch S, detection electronic switch and warning circuit, surveys electronic switch by resistance R 1, triode VT1; VT2 and capacitor C 1 constitute; The base stage of VT1 is connected with an end of resistance, and the emitter of VT1 is connected with the base stage of VT2, and the emitter of VT2 is connected with an end of capacitor C 1; Warning circuit is made up of IC integrated chip, resistance R 2, loudspeaker and capacitor C 2; Be connected with R2 between 1 pin of IC integrated chip and 2 pin; 5 pin of IC integrated chip are connected with the emitter of VT2 with 8 pin; 4 pin of IC integrated chip are connected with loudspeaker, and wherein the voltage range of power supply E is 3-4.5V, and a, the b two ends of surveying electronic switch are connected with telephone wire.
A, b two ends telephone wire are in conducting state under the normal condition, and VT1 and VT2 all are in cut-off state, the emitter no current output of VT2, and alarm is not reported to the police; Telephone wire when a, b two ends is cut off, and VT1 gets base stage bias current conducting because of R1, and VT2 is conducting thereupon also, and the IC integrated chip is because of getting electric work, alarm equipment alarm.
Claims (3)
1. telephone wire wire break alarm; Comprise power supply E and switch S, it is characterized in that: comprise and survey electronic switch and warning circuit, said detection electronic switch is by resistance R 1, triode VT1; VT2 and capacitor C 1 constitute; The base stage of said VT1 is connected with an end of resistance, and the emitter of VT1 is connected with the base stage of VT2, and the emitter of said VT2 is connected with an end of capacitor C 1; Said warning circuit is made up of IC integrated chip, resistance R 2, loudspeaker and capacitor C 2; Be connected with R2 between 1 pin of said IC integrated chip and 2 pin; 5 pin of said IC integrated chip are connected with the emitter of VT2 with 8 pin, and 4 pin of said IC integrated chip are connected with loudspeaker.
2. a kind of telephone wire wire break alarm according to claim 1 is characterized in that: the voltage range of said power supply E is 3～4.5V.
3. a kind of telephone wire wire break alarm according to claim 1 is characterized in that: a of said detection electronic switch, b two ends are connected with telephone wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201160714U CN202563626U (en) | 2012-03-26 | 2012-03-26 | Telephone line disconnection alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201160714U CN202563626U (en) | 2012-03-26 | 2012-03-26 | Telephone line disconnection alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202563626U true CN202563626U (en) | 2012-11-28 |
Family
ID=47213255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201160714U Expired - Fee Related CN202563626U (en) | 2012-03-26 | 2012-03-26 | Telephone line disconnection alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202563626U (en) |
-
2012
- 2012-03-26 CN CN2012201160714U patent/CN202563626U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121128 Termination date: 20130326 |